<template>
  <div id="app">
    <ul>
      <li v-for="(item,index) in arr" :key="index">
        <span >{{item}}</span>
        <button @click="btnStop(index)">删除</button>
      </li>
    </ul>
    <button @click="btnAction">生成</button>
  </div>
</template>

<script>
export default {
  data() {
    return {
      arr: [1, 5, 3,],
    };
  },
  methods:{
    btnStop(index){
       this.arr.splice(index,1)
    },
    btnAction(){
      this.arr.push(parseInt(Math.random() *this.arr.length)) 
    }

  }


}
</script>